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  • Committer: Brian Aker
  • Date: 2008-11-04 15:39:09 UTC
  • mfrom: (575.1.2 devel)
  • Revision ID: brian@tangent.org-20081104153909-c72hn65udxs1ccal
Merge of Monty's work

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m4/cxx_cmath.m4
 
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# We check two things: where the include file is for cmath. We
 
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# include AC_TRY_COMPILE for all the combinations we've seen in the
 
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# wild.  We define one of HAVE_CMATH or HAVE_TR1_CMATH or 
 
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# HAVE_BOOST_CMATH depending
 
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# on location.
 
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m4_define([_AH_NEED_FUNCS],
 
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[AC_FOREACH([AC_Func], [$1],
 
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  [AH_TEMPLATE(AS_TR_CPP([NEED_]AC_Func),
 
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    [Define to 1 if you need to build a local version of `]AC_Func[' function.])])])
 
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AC_DEFUN([AC_CXX_CMATH],
 
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  [AC_MSG_CHECKING(the location of cmath)
 
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   AC_LANG_PUSH(C++)
 
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   ac_cv_cxx_cmath=""
 
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   ac_cv_cxx_cmath_namespace=""
 
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   for location in tr1/cmath boost/cmath cmath; do
 
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     for namespace in __gnu_cxx "" std stdext std::tr1; do
 
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       if test -z "$ac_cv_cxx_cmath"; then
 
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         AC_TRY_COMPILE([#include <$location>],
 
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                        [$namespace::isfinite(1)],
 
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                        [ac_cv_cxx_cmath="<$location>";
 
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                         ac_cv_cxx_cmath_namespace="$namespace";])
 
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       fi
 
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    done
 
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   done
 
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   if test -n "$ac_cv_cxx_cmath"; then
 
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      AC_MSG_RESULT([$ac_cv_cxx_cmath])
 
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   else
 
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      ac_cv_cxx_cmath="<math.h>"
 
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      ac_cv_cxx_cmath_namespace=""
 
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      AC_MSG_RESULT()
 
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      AC_MSG_WARN([Could not find a cmath header.])
 
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      _AH_NEED_FUNCS([isinf isnan isfinite])
 
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      for ac_func in isinf isnan isfinite ; do
 
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        AC_TRY_COMPILE([#include <math.h>],
 
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                       [double x=1.0; $ac_func(x)],
 
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                       [],[AC_DEFINE_UNQUOTED(AS_TR_CPP([NEED_$ac_func]))])
 
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      done
 
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   fi
 
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   AC_DEFINE_UNQUOTED(CMATH_H,$ac_cv_cxx_cmath,
 
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                      [the location of <cmath>])
 
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   if test "x$ac_cv_cxx_cmath_namespace" != "x"
 
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   then
 
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     AC_DEFINE_UNQUOTED(CMATH_NAMESPACE,$ac_cv_cxx_cmath_namespace,
 
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                        [the namespace of C99 math extensions])
 
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   fi
 
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   AC_LANG_POP()
 
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])